Richard,

Thank you for your help again. You are right, wrapping panel.barchart was
not as hard as it seemed to me.

Thanks,
Alex

On Tue, Sep 16, 2008 at 12:44 PM, <Richard.Cotton@hsl.gov.uk> wrote:

> > Thank you for a clear example, it works. I tried to play with
> > superpose.polygon before to no avail, this clarifies things.
>
> You're welcome.
>
> > Another question: would you know how to add gridlines to the plot?
> > I'd like to have a few horizontal gridlines on my barchart plot for
> > better readability. Do I have to write a wrapper for panel.barchart?
>
> Probably, but it's not as bad as it sounds.  To reuse the previous
> example:
>
> barchart(yield ~ site,
>  groups=variety,
>  data = barley,
>   panel=function(...){panel.barchart(...); panel.grid(v=0, ...)})
>
> (The v=0 argument stop vertical grid lines being drawn.)
>
> Regards,
> Richie.
>
> Mathematical Sciences Unit
> HSL
>
>
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